Brian A.

asked • 04/26/16

prove the following trigonometric identity

(sin2∅-1)/(tan2) = (1/sin2∅)-1

Michael J.

This is the second trig identity you have posted that is not correct.  Are you sure you are copying down the problems correctly from the blackboard?  I can tell because I have worked them out myself.
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04/26/16

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